Some Doctors Opt Out of Program, Frustrated With Payment Rates and Mounting Rules

Fewer American doctors are treating patients enrolled in the Medicare health program for seniors, reflecting frustration with its payment rates and pushback against mounting rules, according to health experts.

The number of doctors who opted out of Medicare last year, while a small proportion of the nation's health professionals, nearly tripled from three years earlier, according to the Centers for Medicare and Medicaid Services,...